body {
    font-family: Arial, sans-serif;
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
}

header {
    background-color: #f0f0f0;
    padding: 20px;
    border-radius: 5px;
}

button {
    background-color: #007acc;
    color: white;
    padding: 10px 20px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}